摘要
在高温度梯度真空定向凝固炉中,制备不同C含量的单晶高温合金,研究不同C含量对第二代单晶高温合金显微组织的影响。结果表明:C含量对合金枝晶间距的影响较小;随着C含量增加,共晶含量和尺寸减小,碳化物含量增加,其形貌由块状向骨架状、汉字状转变;随着C含量增加,Ta元素枝晶偏析减轻,Re,W,Mo,Nb元素枝晶偏析加重;C含量对铸态和热处理γ'相尺寸和形貌影响较小;热处理后碳化物的形貌无明显变化。
The single crystal superalloy with different C contents was casted using master alloy of DD6 in the directionally solidified fur-nace. The effect of C content on the microstructure of the second generation single crystal superalloy was investigated. The results show that C content has no obvious effect on the dendrite arm spacing. With the increase of C content, the volume fraction and size of y / y ＇ eutectic decrease. However, the volume fraction of carbide increases, and its morphologies change from blocky shape to frame work-like and Chinese-script-like with the increase of C content. With the increase of carbon content, the segregation of Ta decreases while the segregation of Re, W, Mo, Nb increases. C content has no obvious effect on the shape and size of phase in as cast microstruc-ture or after heat treatment. The morphology of carbide has no distinct change after heat treatment.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2017年第3期9-15,共7页
Journal of Aeronautical Materials
关键词
单晶高温合金
C含量
组织
single crystal superalloy
C content
microstructure
